Enhancement of thermoelectric performance in β-graphyne nanoribbons by suppressing phononic thermal conductance
Enhancement of thermoelectric performance in β-graphyne nanoribbons by suppressing phononic thermal conductance
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DOI：
10.1016/j.carbon.2014.12.059
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发表时间：
2015-04
期刊：
影响因子：
10.9
通讯作者：
Wu-Xing Zhou;Keqiu Chen
中科院分区：
文献类型：
--
作者：
Wu-Xing Zhou;Keqiu Chen
采用非平衡绿色函数方法研究了缺陷β-石墨炔纳米带的热电性能。结果表明，引入缺陷可以显著提高β-石墨炔纳米带的热电性能。缺陷β-石墨炔纳米带的优值可达1.64，约为完整β-石墨炔纳米带优值的6倍。这是由于缺陷β-石墨炔纳米带中的声子热导由于声子与缺陷的强烈散射和声子的强烈局域化而迅速降低的结果。
The thermoelectric properties of the defective β-graphyne nanoribbons are investigated by using the nonequilibrium Green’s function method. The results show that the thermoelectric properties of β-graphyne nanoribbons can be enhanced observably by introducing defects. The figure of merit of defective β-graphyne nanoribbons can reach 1.64, which is about six times larger than that of perfect β-graphyne nanoribbons. This results from the rapid decrease of phononic thermal conductance in defective β-graphyne nanoribbons due to the strong phonon-defect scattering and the intensive localization of phonons.